+ Reply to Thread
Results 1 to 3 of 3

Hybrid View

  1. #1
    Join Date
    Dec 2011
    Posts
    24

    Default Sleepers over concrete

    Hi,
    I'm looking for framing advice. I'm going to create a dining room in teh back of my oversized garage. The garage floor is a concrete slab over a crawl space with a dirt floor. The crawl space is dry. In order to bring the garage floor up a step to match the floor of the house, I plan to construct 2x8 sleepers to support the subfloor of the new space.

    Some of the questions I have are around the space between the concrete and the subfloor. Should I lay a moisture barrier on the concrete floor, under the sleepers? And is spray foam insulation the best to use against that concrete to prevent a chill from rising up through the subfloor? If using spray foam, should the moisture barrier then go between the sleepers and subfloor- or is the spray foam effectify a moisture barrier (except where the sleeper touchess the concerete? So does that mean the sleepers should be raised over the concrete to spray foam is between? Or do I use moisture resistance lumber on the concrete, spray foam, and call it a day?

    I keep circling here- if you were framing a floor over a concrete slab, can anyone suggest the best order of materials?

    Thanks,
    Dave

  2. #2
    Join Date
    Aug 2007
    Posts
    6,480

    Default Re: Sleepers over concrete

    Where wood meets concrete it needs to be pressure treated material. What I would recommend instead is to use Trex, or similar engineered lumber as "feet" under your joists, you won't have any issues of moisture transfer or rot this way, should it ever get damp under there.

    I would leave air space between the cement floor and the framed floor. The reason being, if water ever does get in there, you want it to be able to get back out and to dry out. The air space will allow for this. No need for a moisture barrier with this set up.

    Personally, I'd use fiberglass insulation. It is cheaper and easier to use.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  3. #3
    Join Date
    Dec 2011
    Posts
    24

    Default Re: Sleepers over concrete

    Thanks for the advice. I like that idea- and in fact I have a bunch of leftover trex pieces leftover from a deck project last summer.

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •